Most ball joints are greased with a grease gun with a good quality grease.
You can add power steering fluid to your 1988 Chevy Astro by removing the top to the power steering fluid reservoir. Pour the fluid directly into the reservoir.
Fluid is added through the transmission dipstick.
under the hood
5litres
Just northeast of the starter fluid container
You add it down the dipstick tube.
transmission behind a 4.3 on mine took 3.5 quarts
Drop the lower transmission pan Clean pan Replace filter and gasket
most likely cause is your heater core leaking
5 quarts of Dexron automatic transmission fluid (ATF) according to my Hanes repair manual
with synovial fluid
Sinovial fluid